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83 lines
2.4 KiB
PHP
83 lines
2.4 KiB
PHP
{
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This file is part of the Free Pascal run time library.
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Copyright (c) 2005 by Michael Van Canneyt, Peter Vreman,
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& Daniel Mantione, members of the Free Pascal development team.
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See the file COPYING.FPC, included in this distribution,
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for details about the copyright.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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**********************************************************************}
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{
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Linux ELF startup code for Free Pascal
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%rdx Contains a function pointer to be registered with `atexit'.
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This is how the dynamic linker arranges to have DT_FINI
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functions called for shared libraries that have been loaded
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before this code runs.
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%rsp The stack contains the arguments and environment:
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0(%rsp) argc
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8(%rsp) argv[0]
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...
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(8*argc)(%rsp) NULL
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(8*(argc+1))(%rsp) envp[0]
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...
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NULL
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}
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procedure PASCALMAIN; external name 'PASCALMAIN';
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{******************************************************************************
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Process start/halt
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******************************************************************************}
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procedure _FPC_proc_start; assembler; nostackframe; public name '_start';
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asm
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popq %rsi { Pop the argument count. }
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movq %rsi,operatingsystem_parameter_argc
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movq %rsp,operatingsystem_parameter_argv { argv starts just at the current stack top. }
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leaq 8(,%rsi,8),%rax
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addq %rsp,%rax
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movq %rax,operatingsystem_parameter_envp
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andq $0xfffffffffffffff0,%rsp { Align the stack to a 16 byte boundary to follow the ABI. }
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{ Save initial stackpointer }
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movq %rsp,__stkptr
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xorq %rbp, %rbp
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call PASCALMAIN
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end;
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procedure _FPC_proc_haltproc; assembler; nostackframe; public name '_haltproc';
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asm
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.Lhaltproc:
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movl $231,%eax { exit_group call }
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movzwl operatingsystem_result,%edi
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syscall
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jmp .Lhaltproc
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{ We need this stuff to make gdb behave itself, otherwise
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gdb will chokes with SIGILL when trying to debug apps.
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}
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.section ".note.ABI-tag", "a"
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.align 4
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.long 1f - 0f
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.long 3f - 2f
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.long 1
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0: .asciz "GNU"
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1: .align 4
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2: .long 0
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.long 2,4,0
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3: .align 4
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.section .note.GNU-stack,"",@progbits
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end;
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